Mt6789 Auth Bypass Better //top\\ -

Report Title:

Pre-Authentication Exploitation via Bootrom USB Enumeration on MediaTek MT6789 (Auth Bypass) Affected Component: Preloader / Bootrom USB Handshake (SLA & DAA) Firmware Version: Any prior to vendor patch MT6789_Security_Update_2025_01

Pro Tip

: If the device doesn't enter Preloader mode automatically when connected powered-off, use the command adb reboot edl from a powered-on state to force it. mt6789 auth bypass better

The cleanest method uses a known vulnerability in the preloader's USB vendor request handler. This is the "better" way because it requires no hardware modification. MTK Client Official tools (SP Flash Tool v5

MTK Client

Official tools (SP Flash Tool v5.21xx) enforce strict authentication. Better bypasses use modified versions of brom.dll or da_loader.bin that inject a payload before the auth check completes. Tools like (open-source) have implemented partial bypasses for the MT6789 by exploiting a race condition in the USB control transfer. mt6789 auth bypass better

Traditional "bypasses" involved shorting specific capacitors (CLK, EMMC_DATA, or CMD lines) to ground to glitch the bootrom into skipping this check. This works on older chips like MT65xx or MT67xx. However, the MT6789 implements rigorous anti-rollback and secure boot 2.0. Shorting often results in a dead device or a complete BROM panic.